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In the case of decreasing the pixel number (scaling down), this usually results in a visible quality loss. From the standpoint of digital signal processing, the scaling of raster graphics is a two-dimensional example of sample-rate conversion, the conversion of a discrete signal from a sampling rate (in this case, the local sampling rate) to ...
Sometimes, you find a drawing or similar image useful for a Wikipedia article, that was saved as a JPEG but should have been saved as a PNG.JPEG is good for images where the color changes fluidly throughout the image, like in a photograph, whereas PNG files are good for images with relatively few colors, such as a drawing of a flag, a chart, or a map; note that sometimes SVG is better.
Yes-Logo.JPG (396 × 367 pixels, file size: 17 KB, MIME type: image/jpeg) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
The Kodak Pro Photo CD Master Disc contains 25 images with maximum resolution of 6144 x 4096 pixels (six resolutions per file, Base/16 to 64 Base). This type is appropriate for 120 film, 4x5, but also for small picture film, if highest resolution is required.
Original file (2,100 × 817 pixels, file size: 16 KB, MIME type: image/png) Summary. File information Description ... File:SFO Logo.png (file redirect) Metadata.
Size of this PNG preview of this SVG file: 545 × 183 pixels. Other resolutions: 320 × 107 pixels | 640 × 215 pixels | 1,024 × 344 pixels | 1,280 × 430 pixels | 2,560 × 860 pixels . Original file (SVG file, nominally 545 × 183 pixels, file size: 2 KB)
Size of this PNG preview of this SVG file: 800 × 360 pixels. Other resolutions: ... Original file (SVG file, nominally 2,000 × 900 pixels, file size: 182 KB)